71596381 has 4 divisors (see below), whose sum is σ = 72459072. Its totient is φ = 70733692.

The previous prime is 71596363. The next prime is 71596397. The reversal of 71596381 is 18369517.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71596381 - 2⁷ = 71596253 is a prime.

It is a super-2 number, since 2×71596381² = 10252083544594322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71596321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431221 + ... + 431386.

It is an arithmetic number, because the mean of its divisors is an integer number (18114768).

Almost surely, 2^71596381 is an apocalyptic number.

71596381 is the 5352-nd centered pentagonal number.

It is an amenable number.

71596381 is a deficient number, since it is larger than the sum of its proper divisors (862691).

71596381 is an equidigital number, since it uses as much as digits as its factorization.

71596381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862690.

The product of its digits is 45360, while the sum is 40.

The square root of 71596381 is about 8461.4644713548. The cubic root of 71596381 is about 415.2379358451.

The spelling of 71596381 in words is "seventy-one million, five hundred ninety-six thousand, three hundred eighty-one".